The work on a new module has begun to plot OpenTURNS graphs through matplotlib.

Those who want a preview of the capabilities can check it out here:
viewer

This development is not finalized yet, but we welcome any comments.
To test it, just download this single python script and run it, it will show the following examples.
You can copy it somewhere in your openturns python module path (/usr/lib/python2.7/dist-packages/openturns on debian/ubuntu)